Table 1.

Genetic similarities between partners

PopulationLocationActual couplesMatched random pairs
Mean IBD sharing, %Mean number of IBD blocksMean length of IBD blocks, cMMean IBD sharing, %Mean number of IBD blocksMean length of IBD blocks, cM
MexicanSan Francisco0.3615.51.40.198.31.2
Mexico City0.3515.71.40.2613.91.3
Puerto RicanNew York City0.7020.42.10.4217.31.8
San Juan0.9125.32.20.5418.01.9
  • Identical-by-descent sharing in Mexican and Puerto Rican couples. IBD sharing was computed for GALAI couples, and IBD sharing for ancestry-matched random pairs was also computed as a benchmark. In each location, the differences in IBD sharing, number of blocks, and length of blocks between the actual couples and matched random pairs were significant (P < 0.01, permutation test).